Trimagnesium phosphate

Trimagnesium phosphate
Names
IUPAC name
Trimagnesium Diphosphate
Other names
magnesium phosphate, phosphoric acid, magnesium salt (2:3), tertiary magnesium phosphate, trimagnesium phosphate
Identifiers
3D model (JSmol)
ECHA InfoCard 100.028.931
E number E343 (antioxidants, ...)
15662
UNII
Properties
Mg3O8P2
Molar mass 262.85 g·mol−1
Appearance White crystalline powder
Melting point 1,184 °C (2,163 °F; 1,457 K)
Insoluble
Solubility Soluble in salt solution
−167·10−6 cm3/mol (+4 H2O)
Hazards
R-phrases (outdated) R25, R36, R37, R38
NFPA 704
Flammability code 0: Will not burn. E.g., waterHealth code 1: Exposure would cause irritation but only minor residual injury. E.g., turpentineReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogenSpecial hazards (white): no codeNFPA 704 four-colored diamond
0
1
0
Flash point N/A
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Trimagnesium phosphate describes inorganic compounds with formula Mg3(PO4)2.xH2O. They are magnesium acid salts of phosphoric acid, with varying amounts of water of crystallization: x = 0, 5, 8, 22.[1]

The octahydrate forms upon reaction of stoichiometric quantities of monomagnesium phosphate with magnesium hydroxide.

Mg(H2PO4)2 + Mg(OH)2 → Mg3(PO4)2•8H2O

The octaohydrate is found in nature as the mineral bobierrite.[2]

The anhydrous compound is obtained by heating the hydrates to 400 °C. It is isostructural with cobalt(II) phosphate. The metal ions occupy both octahedral (six-coordinate) and pentacoordinate sites in a 1:2 ratio.[3]

Safety

Magnesium phosphate tribasic is listed on the FDA's generally recognized as safe, or GRAS, list of substances.[4]

See also

References

  1. ↑ Klaus Schrödter; Gerhard Bettermann; Thomas Staffel; Friedrich Wahl; Thomas Klein; Thomas Hofmann (2008). "Phosphoric Acid and Phosphates". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a19_465.pub3. ISBN 978-3527306732.
  2. ↑ "magnesium phosphate - Compound Summary". Retrieved 29 May 2012.
  3. ↑ Nord, A. G.; Stefanidis, T. (1983). "Structure of cobalt(II) phosphate Structure Refinements of Co3(PO4)2. A Note on the Reliability of Powder Diffraction Studies". Acta Chemica Scandinavica A. 37: 715–p721.
  4. ↑ "TRIMAGNESIUM PHOSPHATE". Retrieved 29 May 2012.
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